Hy 69Cuda, tubeless wheels became the factory standard wheel in all the trucks in 1956, and even though the wheelbase was increased in 1957 the same fender is listed in the parts book from 55 to 57 for the series 6 trucks, so I would think that the wheels would fit and clear if you put the fenders from a 55 on the front of a 58/59 chassis. Please do your experimenting and let us know the result.
